1. Objectives Compare linear, quadratic, and exponential models.
Given a set of data, decide which type of function models the data and write an equation to describe the function.

2. Look at the tables and graphs below
Look at the tables and graphs below. The data show three ways you have learned that variable quantities can be related. The relationships shown are linear, quadratic, and exponential.

3. Look at the tables and graphs below
Look at the tables and graphs below. The data show three ways you have learned that variable quantities can be related. The relationships shown are linear, quadratic, and exponential.

4. Look at the tables and graphs below
Look at the tables and graphs below. The data show three ways you have learned that variable quantities can be related. The relationships shown are linear, quadratic, and exponential.

5. In the real world, people often gather data and then must decide what kind of relationship (if any) they think best describes their data.
Another way to decide which kind of relationship (if any) best describes a data set is to use patterns.
After deciding which model best fits the data, you can write a function. Recall the general forms of linear, quadratic, and exponential functions.

6. When the independent variable changes by a constant amount,
linear functions have constant first differences.
quadratic functions have constant second differences.
exponential functions have a constant ratio.
Remember!